[Tinyos-help] FCS - TinyOS 1.x (Tmote)

[Terence Joseph]

Thanks for that but could you please tell me then what the third and second 
last bytes represent (F0 CE in the example below)?  They are not data but 
come after the data field.

Regards,
Terence.


>From: "Joe Polastre" <joe at polastre.com>
>To: "Terence Joseph" <tjormor at hotmail.com>
>CC: tinyos-help at millennium.berkeley.edu
>Subject: Re: [Tinyos-help] FCS - TinyOS 1.x (Tmote)
>Date: Fri, 3 Nov 2006 09:06:26 -0800
>
>The FCS isn't transmitted over the serial port.
>
>-Joe
>
>On 11/1/06, Terence Joseph <tjormor at hotmail.com> wrote:
>>Hi,
>>
>>I am collecting data on the serial port and I was just wondering over 
>>which
>>fields the FCS is calculated in software as I can't seem to reproduce the
>>value I see?
>>
>>The raw packet is the following (including esc chars):
>>
>>7E 42 00 01 08 AA FF FF FF FF 04 7D 5D F0 CE 7E
>>
>>The FCS is the third and second last byte: 0xCEFO.  There is no data 
>>payload
>>(hence 00 for 3rd byte).
>>
>>Over which fields is the FCS calculated?  The length field is normally not
>>included so I assumed it was just these byte {01 08 AA FF FF FF FF 04 7D 
>>5D}
>>but if you check any online CRC calc. this does not prodcue 0xCEFO.
>>
>>Can anyone clarify.  Any help is much appreciated, thanks.
>>
>>Best Regards,
>>Terence.
>>
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